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Finding the Fourth Proportional to 1,120.15, 1,545.78 and 654.40

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Solution

The fourth proportional to 1,120.15, 1,545.78 and 654.40 is: 903.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.15 : 1,545.78 = 654.40 : x
  2. Step 2: Convert to fraction form
    1,120.15/1,545.78 = 654.40/x
  3. Step 3: Cross multiply
    1,120.15x = 1,545.78 × 654.40
  4. Step 4: Simplify right side
    1,120.15x = 1,011,558.43
  5. Step 5: Solve for x
    x = 1,011,558.43/1,120.15
  6. Step 6: Final answer
    x = 903.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.